Pressure-gage.



UNITED STATES PATENT NE'jcricUr, Ass

GNORS TO THE MONARCH lilvANUFAC'lURING COMPANY,

.Pnra'ssuFria-encre.y

SPECFICATION form-ing part of Letters Patent N o. 670,999, dated April2, 1901.v Application liled January 8, 1900. Serial No. 794. (No model.)

. To all whom may concern.; Be it known that we, ARTHUR .L PURIN- 'roNand LEONARD W. SWEET, citizens of the 1 United States, residing atWaterbury, inthe county of New'Haven and lState of Connectiout, have invented certain new and useful Improvements in4 Pressure-Gages, of whichthe following isaspecilication,

The invention relates to a gage that is so ro constructed that shouldthe pressure in a pipe, chest, boiler, .or other receiver or chamberwithjwhich it communicateschange to a predetermined degree an`electrical circuit will be closed in the gage. "This gage isparticularly adapted fornse with an engine-stop of thenatureof thatshown and described in i United States Letters Patent No. 599,014,

granted February 15, 1898, whereby wlfen the circuit is closed in thegage the stop is caused zo to operate the valve with which itisconnected,

although it is adapted for use with a vacuumbreaker like that set forthin United States Letters Patent. for a system for stopping engines, No.635,080, granted October 17, 1899,

2 5 for causing the vacuum to be broken when it changes to thepredetermined point;

The object of the invention is to provide a simple instrument of. thisnature with electrical terminals adj ustably arranged to be 3o so setthat electrical contact will be made and the circuit closed -in tliegage at the exact del sired pressure.

In the forms of the invention illustrated` there is one electricalconducting-terminal that is moved by the movement of the curvedpressure-tube of the gage as the pressure 7changes, and there is anotherelectrical con.

ducting terminal that is adjustably fixed with relation to thev movableterminal, which 4o terminals are so located that when the pressurevaries from the desired amount the movable terminal is carried oppositethe adjustably-fixed terminal, causing them to make contact and closethe circuit, so the stop or vacuum-breaker in the circuit will be set inoperation, as more particularly hereinafter described, and pointed outin the claims.

'Figure 1 of the accompanying drawings is a front viewpf .a gage 'thatembodies the invention with the cover, hand, andV most of .the dialomitted. Fig. 2 is a View of the back of the same-gage. Fig. 3 is a sideviewof this gage with the case and pressure tube cut in section.

In the circular case l is an ordinary curved 55 pressure-tube f2, thefixed end of which is adaptedto be connected by a nipple 3 with a pipe,chest, boiler, or other receiver or chamber in which there isliuid-pressureto becontrolled. The' free end of the tube is connected bya linke with a lever 5, mounted upon an arbor 6, that is lheld. byplates 7and 8, which are connected by posts 9 and secured to the back ofthe case in any desired manner. The lever has a segmental rack 10, theteeth of which mesh with the teeth of the pinion 11, thatis mounted uponthe arbei- 12. This arbor outside ofthe indexed dial 13 `bears anindicating-hand 14, and inside of the dial 'one end of a spring l5 isattached to 7o the arbor for returning the hand toward zero inopposition to the movement effected by the straightening of the tube asthe pressure changes.

In the form of the invention illustrated an arm 16 is'pivoted upon thelower end of the arbor 6. The free end of this arm has a stud 17, thatextends through a slot 18 in the back plate of the case, which stud isprovided with a pointer 19 and a uut 20. On the outside ot' 8o the backof the case, adjacent to the slot and in position to coperatc with thepointer, is a scale 21. The arm and pointer may be clamped by tighteningthe nut; but when 'the nut is loosened the pointer and arm may be movedand set as desired.

A block 22 of insulating material is attached to the arm inside of thecase, and mounted upon this block is ayieldingconducting-Hugger 23. Thisinsulated finger, .which forms the 9o adj ustably-fixed terminal of thecircuit in the gage, is connected by insulated wire 21 with abinding-post 25, whichis insulated from the case. The binding-post 2G isin electrical connection with the case, andwhen the pin 28, projectingfrom the segment l0, which pin forms the movable terminal, engages thefinger 23 an electrical connection is made through thefpa'rts from onebinding-post to the other.

IOO

When the nut on theback which clamps the arm in position is loosened,the arm may be swung to bring the finger-terminal in such position thatthe pin'- terminal will engage This apparatus can of course beconnectedwyith a bell or other apparatus besides an anp` tomaticvalve-closing apparatus and vacuumbreaker, and the terminals may be soadjusted that contact will be made and the apparatus set in actioneither when an undue frise Ain pressure occurs or a sudden fall inpressure takes place.

This apparatus isfvery simple, and it is readily adjusted so as tooperate accurately when the emergency arises.

We claim as our invention-'- 1. A pressuregage having avcase, apressure-tube, an electrical terminal moved'by the variations of thetube,a binding-post in electrical connection withthe movable termi- Ynal, a pivoted arm bearing aninsulated terminal within the case, a-studprojecting from the arm through a slot in the back plate of the case, aclamp-nut on .the outside of the back plate for fixing the stud inposition, and an insulated binding-'post in electrical connection withthe* insulated terminal on the pivoted arm, substantially as specied.

2. A pressure-gage having a case, a' pressure-tube, an electricalterminal moved by the variations of the tube, a binding-post inelectrical connection with the movable terminal, a pivoted arm bearing,ran insulated tery minal within the case, a stud projecting from the armthrough a slot in' the back plate of the case, a pointer movable withthe stud and a scale' on the back of the case adjacent to the slot inposition to coperate with the pointer in indicating the position of theinsulated terminal on the arm, substantially as specified.

3. A pressure-gage having a case, a pressure-tube, a link connected'withthe free end of the pressnre=tube, a leverconnected with the link, asegmental rack connected 4with the lever, apinion mounted on .thepointerarbor and engaged by the rack, a circuit-terminal connected withthe rack, a bindingpost in' electrical connection with the terminal onthe rack, a pivoted arm 'bearngan insulated terminal within the case andhaving an end extending through the back plate ol" the case, and aninsulated binding-post in electrical connection with the insulatedterminal, substantially as specified.

ARTHUR J. PURINTON. LEONARD W. SWEET.

Witnesses:

ERNEST S. BENTON, ALICE S. HUDSON..

